As suggested by a couple players, I will slowly populate a list of NPCs.

So far, we have:

The Maharishi of Excellence, a god who seems prominent in Trademeet Dale. He is a bit portly and obviously well-to-do, of middling but indeterminate apparent age, and enjoys the finer things in life.

Fire Soul, also known as Poe, is a young entrepreneur of nearly 15 years. She has so far only been seen working closely with Hun.

Ocean Soul, also known as Hun, is a young entrepreneur of nearly 15 years. He has so far only been seen working closely with Poe.

Purity of Purpose is a Sidereal who seems to have some acquaintance with Evangelical Design. She's a bit self-centered and arrogant. Of course, nobody but Sevastian and Evangelical Design are likely to remember her. Lasting Grace, her only known Resplendent Destiny, has met K and Aya, variously.

The only recurring minor NPC so far that I can think of off the top of my head is the goat boy, who has finally been reunited with his goat. Oh, and, of course, the troublesome goat itself.